I think Michael Myers vs. Pinhead would be a silly combination. They should use another serial killer type with Michael Myers, like Jason or Leatherface. Maybe they could pit him against Simon from "The Ugly."

If they want a "Pinhead vs." movie, they should pit him against another supernatural monster type (rather than just an unstoppable human maniac), like Samara/Sadako from "The Ring/Ringu" or a classic movie monster like Dracula.